815 Area Code: Location, Cities, Map And Time Zone

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Area code 815 is in Illinois, USA , spanning 24 counties and serving 248 cities , including Joliet, Rockford or Plainfield; it currently uses 786 prefixes , assigned from 815-200-XXXX through 815-999-XXXX.

In service since January 01, 1947, area code 815 is the parent Numbering Plan Area in overlay complex 815/779.

The current local time is .

815 area code location on a map
© OpenStreetMap contributorsFor exact NPA boundaries see official 815 area code map

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More Illinois area codes:

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Locate any 815-NXX prefix:

815-200-XXXX --- 815-299-XXXX
NPANXX Carrier1 Area Served2 Date3
815-200 Paetec Itel La Salle 6/20/2006
815-201 Bandwidth.com Clec Sheridan 8/15/2012
815-202 New Cingular Wireless PCS Oglesby 4/8/2008
815-203 USA Mobility Wireless Joliet N/A
815-204 USA Mobility Wireless Crystal Lake N/A
815-205 Centurylink Communications Coal City 1/31/2014
815-206 Illinois Bell Tel Co Woodstock N/A
815-207 Teleport Communications America Joliet N/A
815-208 Mediacom Telephony Of Illinois Fulton N/A
815-209 Level 3 Communications Rockford 2/4/2002
815-210 New Cingular Wireless PCS Joliet N/A
815-212 T-Mobile USA Joliet N/A
815-213 United States Cellular Sterling 9/29/2004
815-214 Rcn Telecom Services Of Illinios Kankakee N/A
815-215 First Communications New Lenox 2/4/2002
815-216 Cellco Partnership Kankakee N/A
815-217 Digital Network Access Communications De Kalb N/A
815-218 Cellco Partnership Rockford N/A
815-219 MetroPCS Crystal Lake 6/6/2006
815-220 Illinois Bell Tel Co La Salle N/A
815-221 Teleport Communications America Lockport N/A
815-222 Cellco Partnership Rockford N/A
815-223 Illinois Bell Tel Co La Salle N/A
815-224 Illinois Bell Tel Co La Salle N/A
815-225 Citizens Telecom Co Illinois-Frontier Citizens -IL Milledgeville N/A
815-226 Illinois Bell Tel Co Rockford N/A
815-227 Illinois Bell Tel Co Rockford N/A
815-228 New Cingular Wireless PCS Oglesby N/A
815-229 Illinois Bell Tel Co Rockford N/A
815-230 Level 3 Communications Plainfield N/A
815-231 Illinois Bell Tel Co Rockford N/A
815-232 Frontier North Freeport N/A
815-233 Frontier North Freeport N/A
815-234 Frontier North Byron N/A
815-235 Frontier North Freeport N/A
815-236 New Cingular Wireless PCS Woodstock N/A
815-237 Illinois Bell Tel Co Gardner N/A
815-238 Cellco Partnership Freeport N/A
815-239 Frontier North Pecatonica N/A
815-240 Charter IP Enabled Services Rock Cut 10/18/2010
815-241 American Messaging Services Northbrook N/A
815-242 Bandwidth.com Clec Minooka 5/2/2014
815-243 United States Cellular Rockford N/A
815-244 Brightspeed Of Illinois Mount Carroll N/A
815-245 New Cingular Wireless PCS Woodstock N/A
815-246 Frontier North Earlville N/A
815-247 Frontier North Seward N/A
815-248 Frontier North Durand N/A
815-249 Frontier North Grand Ridge N/A
815-250 Comcast IP Phone La Salle 8/25/2006
815-251 Brightspeed Of Illinois Nelson N/A
815-252 New Cingular Wireless PCS Oglesby N/A
815-253 Frontier Communications Of Illinois Kempton N/A
815-254 Illinois Bell Tel Co Plainfield N/A
815-255 Paetec Itel Minooka 11/3/2009
815-256 Stelle Tel. Co. Stelle N/A
815-257 Cellco Partnership Streator N/A
815-258 New Cingular Wireless PCS Joliet N/A
815-259 Brightspeed Of Illinois Thomson N/A
815-260 T-Mobile USA Joliet N/A
815-261 MCIMetro Access Transmission Services Crystal Lake N/A
815-262 Cellco Partnership Rockford N/A
815-263 Cellco Partnership Kankakee N/A
815-264 Frontier North Waterman N/A
815-265 Illinois Bell Tel Co Gilman N/A
815-266 Frontier North Freeport N/A
815-267 MCIMetro Access Transmission Services Plainfield N/A
815-268 Illinois Bell Tel Co Onarga N/A
815-269 Frontier Communications Of The Carolinas Danforth N/A
815-270 Charter IP Enabled Services Roscoe 4/24/2007
815-271 MCIMetro Access Transmission Services Mchenry N/A
815-272 MCIMetro Access Transmission Services Joliet N/A
815-273 Brightspeed Of Illinois Savanna N/A
815-274 New Cingular Wireless PCS Joliet N/A
815-275 Cellco Partnership Freeport N/A
815-276 Teleport Communications America Crystal Lake N/A
815-277 Teleport Communications America Frankfort N/A
815-278 Cellco Partnership Kankakee N/A
815-279 American Messaging Services Kankakee N/A
815-280 Teleport Communications America Joliet N/A
815-281 United States Cellular Galena 6/15/2004
815-282 Illinois Bell Tel Co Rockford N/A
815-283 Mediacom Telephony Of Illinois Waterman 3/5/2010
815-284 Brightspeed Of Illinois Dixon N/A
815-285 Brightspeed Of Illinois Dixon N/A
815-286 Frontier North Hinckley N/A
815-287 Illinois Bell Tel Co Verona N/A
815-288 Brightspeed Of Illinois Dixon N/A
815-289 United States Cellular Rockford N/A
815-290 AT&T Enterprises Minooka 2/10/2006
815-291 United States Cellular Freeport N/A
815-292 Bergen Tel. Co. South Bergen N/A
815-293 Illinois Bell Tel Co Lockport N/A
815-294 USA Mobility Wireless La Grange N/A
815-295 T-Mobile USA Kankakee N/A
815-296 Telnyx Rockford 11/20/2019
815-297 Frontier North Freeport N/A
815-298 Cellco Partnership Rockford N/A
815-299 United States Cellular Rockford N/A
815-300-XXXX --- 815-399-XXXX
NPANXX Carrier1 Area Served2 Date3
815-300 Illinois Bell Tel Co New Lenox 12/22/2010
815-301 Level 3 Communications Crystal Lake N/A
815-302 MetroPCS Joliet N/A
815-303 Cellco Partnership Princeton N/A
815-304 Level 3 Communications Kankakee N/A
815-305 Level 3 Communications Gardner N/A
815-306 Level 3 Communications Lockport N/A
815-307 Level 3 Communications Mchenry N/A
815-308 Level 3 Communications Woodstock N/A
815-309 Aero North Communications Shannon 7/18/2006
815-310 Level 3 Communications Utica N/A
815-312 Onvoy Rockford 12/15/2008
815-313 Level 3 Communications Ottawa N/A
815-314 Level 3 Communications Manhattan N/A
815-315 Level 3 Communications Rockford N/A
815-316 Level 3 Communications Rockford N/A
815-317 Level 3 Communications Crescent City N/A
815-318 Level 3 Communications Morris N/A
815-319 United States Cellular Rockford N/A
815-320 Peerless Network Of Illinois New Lenox 4/28/2009
815-321 Onvoy Woodstock N/A
815-322 Level 3 Communications Mchenry N/A
815-323 Level 3 Communications Belvidere 2/10/2005
815-324 MCC Telephony Ottawa 1/8/2010
815-325 New Cingular Wireless PCS Joliet N/A
815-326 New Cingular Wireless PCS Oglesby N/A
815-327 Level 3 Communications Plainfield N/A
815-328 Level 3 Communications Lockport N/A
815-329 AT&T Enterprises Rockford 3/11/2013
815-330 First Communications Crescent City N/A
815-331 Level 3 Communications Mchenry N/A
815-332 Frontier North Cherry Valley N/A
815-333 Level 3 Communications Woodstock N/A
815-334 Illinois Bell Tel Co Woodstock N/A
815-335 Frontier North Winnebago N/A
815-336 Citizens Telecom Co Illinois-Frontier Citizens -IL Coleta N/A
815-337 Illinois Bell Tel Co Woodstock N/A
815-338 Illinois Bell Tel Co Woodstock N/A
815-339 Frontier North Granville N/A
815-340 Comcast IP Phone La Moille 8/25/2006
815-341 New Cingular Wireless PCS Joliet N/A
815-342 New Cingular Wireless PCS Joliet N/A
815-343 New Cingular Wireless PCS Oglesby N/A
815-344 Illinois Bell Tel Co Mchenry N/A
815-345 Level 3 Communications Woodstock N/A
815-346 Level 3 Communications Gardner N/A
815-347 Cellco Partnership Woodstock N/A
815-348 Paetec Itel Kankakee 10/16/2009
815-349 MCIMetro Access Transmission Services Mchenry N/A
815-350 Aero North Communications Franklin Grove N/A
815-351 Cellco Partnership Kankakee N/A
815-352 Level 3 Communications Kankakee N/A
815-353 Cellco Partnership Woodstock N/A
815-354 Cellco Partnership Woodstock N/A
815-355 Cellco Partnership Woodstock N/A
815-356 Illinois Bell Tel Co Crystal Lake N/A
815-357 Illinois Bell Tel Co Seneca N/A
815-358 C-R Telephone Co. Cornell N/A
815-359 Brightspeed Of Illinois Harmon N/A
815-360 Aero North Communications Sublette N/A
815-361 Level 3 Communications Manhattan N/A
815-362 Frontier North German Valley N/A
815-363 Illinois Bell Tel Co Mchenry N/A
815-364 Level 3 Communications Morris N/A
815-365 Frontier North Reddick N/A
815-366 Level 3 Communications Ottawa N/A
815-367 Frontier North Winslow N/A
815-368 Frontier North Lostant N/A
815-369 Frontier North Lena N/A
815-370 Cellco Partnership Kankakee N/A
815-371 Level 3 Communications Utica N/A
815-372 Illinois Bell Tel Co Lockport N/A
815-373 Paetec Itel Elwood 11/4/2009
815-374 Paetec Itel Dwight 11/4/2009
815-375 United States Cellular De Kalb N/A
815-376 Frontier North Ohio N/A
815-377 Level 3 Communications Crescent City N/A
815-378 T-Mobile USA Rockford N/A
815-379 Frontier North Walnut N/A
815-380 Level 3 Communications Sterling N/A
815-381 Illinois Bell Tel Co Rockford N/A
815-382 New Cingular Wireless PCS Woodstock N/A
815-383 New Cingular Wireless PCS Crescent City N/A
815-384 Frontier North Creston N/A
815-385 Illinois Bell Tel Co Mchenry N/A
815-386 Cellco Partnership Kankakee N/A
815-387 Illinois Bell Tel Co Rockford N/A
815-388 MetroPCS Mchenry N/A
815-389 Illinois Bell Tel Co South Beloit N/A
815-390 Comcast IP Phone Braidwood 10/14/2004
815-391 Illinois Bell Tel Co Rockford N/A
815-392 Kinsman Mutual Tel. Co. Kinsman N/A
815-393 Frontier North Monroe Center N/A
815-394 Illinois Bell Tel Co Rockford N/A
815-395 Illinois Bell Tel Co Rockford N/A
815-396 Frontier North Steward N/A
815-397 Illinois Bell Tel Co Rockford N/A
815-398 Illinois Bell Tel Co Rockford N/A
815-399 Illinois Bell Tel Co Rockford N/A
815-400-XXXX --- 815-499-XXXX
NPANXX Carrier1 Area Served2 Date3
815-400 Mediacom Telephony Of Illinois Morrison 2/15/2010
815-401 Level 3 Communications Kankakee N/A
815-402 Level 3 Communications Galena N/A
815-403 MetroPCS Mchenry N/A
815-404 MetroPCS Crystal Lake N/A
815-405 T-Mobile USA Joliet N/A
815-406 Frontier North Byron N/A
815-407 Illinois Bell Tel Co Lockport N/A
815-408 Bandwidth.com Clec Utica N/A
815-409 Cellco Partnership Joliet 8/18/2005
815-410 Level 3 Communications La Salle 2/4/2002
815-412 Level 3 Communications Frankfort N/A
815-413 First Communications Morris N/A
815-414 New Cingular Wireless PCS Earlville 10/14/2004
815-415 Illinois Bell Tel Co Seneca N/A
815-416 Illinois Bell Tel Co Morris N/A
815-417 Illinois Bell Tel Co Braidwood N/A
815-418 First Communications Manhattan N/A
815-419 Cellco Partnership Pontiac 3/19/2003
815-420 Onvoy Rockford N/A
815-421 Illinois Bell Tel Co Herscher N/A
815-422 Illinois Bell Tel Co St Anne N/A
815-423 Illinois Bell Tel Co Elwood N/A
815-424 Illinois Bell Tel Co Elwood N/A
815-425 Level 3 Communications Crystal Lake N/A
815-426 Illinois Bell Tel Co Herscher N/A
815-427 Illinois Bell Tel Co St Anne N/A
815-428 Frontier North Martinton N/A
815-429 Frontier North Sheldon N/A
815-430 First Communications Mchenry N/A
815-431 Illinois Bell Tel Co Ottawa N/A
815-432 Illinois Bell Tel Co Watseka N/A
815-433 Illinois Bell Tel Co Ottawa N/A
815-434 Illinois Bell Tel Co Ottawa N/A
815-435 Frontier North Beaverville N/A
815-436 Illinois Bell Tel Co Plainfield N/A
815-437 Frontier North Putnam N/A
815-438 Citizens Telecom Co Illinois-Frontier Citizens -IL Tampico N/A
815-439 Illinois Bell Tel Co Plainfield N/A
815-440 Cellco Partnership Dixon N/A
815-441 Cellco Partnership Sterling N/A
815-442 Tonica Tel. Co. Tonica N/A
815-443 Frontier North Pearl City N/A
815-444 Illinois Bell Tel Co Crystal Lake N/A
815-445 Frontier North Manlius N/A
815-446 Frontier North Cedarpoint N/A
815-447 Frontier Communications Of Depue Depue N/A
815-448 Illinois Bell Tel Co Mazon N/A
815-449 Frontier North Dakota N/A
815-450 New Cingular Wireless PCS Momence 7/27/2004
815-451 New Cingular Wireless PCS Woodstock N/A
815-452 Frontier North Toluca N/A
815-453 Frontier North Ashton N/A
815-454 Frontier North Sheffield N/A
815-455 Illinois Bell Tel Co Crystal Lake N/A
815-456 Frontier North Franklin Grove N/A
815-457 Frontier Communications Of The Carolinas Cissna Park N/A
815-458 Illinois Bell Tel Co Braidwood N/A
815-459 Illinois Bell Tel Co Crystal Lake N/A
815-460 First Communications Joliet N/A
815-461 MCIMetro Access Transmission Services Lockport N/A
815-462 Illinois Bell Tel Co New Lenox N/A
815-463 Illinois Bell Tel Co New Lenox N/A
815-464 Illinois Bell Tel Co Frankfort N/A
815-465 Illinois Bell Tel Co Grant Park N/A
815-466 Illinois Bell Tel Co Grant Park N/A
815-467 Illinois Bell Tel Co Minooka N/A
815-468 Illinois Bell Tel Co Manteno N/A
815-469 Illinois Bell Tel Co Frankfort N/A
815-470 Illinois Bell Tel Co Rockford N/A
815-471 Cellco Partnership Watseka N/A
815-472 Illinois Bell Tel Co Momence N/A
815-473 Frontier Communications Of The Carolinas Woodland N/A
815-474 New Cingular Wireless PCS Joliet N/A
815-475 Illinois Bell Tel Co Plattville N/A
815-476 Illinois Bell Tel Co Wilmington N/A
815-477 Illinois Bell Tel Co Crystal Lake N/A
815-478 Illinois Bell Tel Co Manhattan N/A
815-479 Illinois Bell Tel Co Crystal Lake N/A
815-480 USA Mobility Wireless Rockford 3/22/2001
815-481 Cellco Partnership La Grange N/A
815-482 T-Mobile USA Woodstock N/A
815-483 MetroPCS Joliet N/A
815-484 Illinois Bell Tel Co Rockford N/A
815-485 Illinois Bell Tel Co New Lenox N/A
815-486 Frontier North Donovan N/A
815-487 First Communications Plainfield N/A
815-488 Cellco Partnership La Grange N/A
815-489 Illinois Bell Tel Co Rockford N/A
815-490 Illinois Bell Tel Co Rockford N/A
815-491 Nuso Rockford 3/13/2013
815-492 Frontier North Apple River N/A
815-493 Citizens Telecom Co Illinois-Frontier Citizens -IL Lanark N/A
815-494 United States Cellular Rockford N/A
815-495 Frontier North Leland N/A
815-496 Frontier North Sheridan N/A
815-497 Frontier North Compton N/A
815-498 Frontier North Somonauk N/A
815-499 United States Cellular Sterling N/A
815-500-XXXX --- 815-599-XXXX
NPANXX Carrier1 Area Served2 Date3
815-500 MCC Telephony Marseilles N/A
815-501 MetroPCS De Kalb N/A
815-502 First Communications Woodstock N/A
815-503 MetroPCS Mendota N/A
815-504 First Communications Gardner N/A
815-505 T-Mobile USA Rockford N/A
815-506 Level 3 Communications Union 2/27/2002
815-507 Level 3 Communications Momence 12/28/2001
815-508 New Cingular Wireless PCS De Kalb 6/16/2004
815-509 T-Mobile USA Rockford N/A
815-510 Mediacom Telephony Of Illinois Streator 1/8/2010
815-512 First Communications Lockport N/A
815-513 Level 3 Communications Morris 2/27/2002
815-514 T-Mobile USA Joliet 1/24/2001
815-515 Level 3 Communications Watseka 2/4/2002
815-516 T-Mobile USA Rockford 1/24/2001
815-517 MCIMetro Access Transmission Services De Kalb 6/28/2004
815-518 First Communications Coal City 10/23/2001
815-519 T-Mobile USA Rockford N/A
815-520 Cellco Partnership Rockford N/A
815-521 Illinois Bell Tel Co Minooka N/A
815-522 Frontier North Kirkland N/A
815-523 Teleport Communications America Kankakee N/A
815-524 Teleport Communications America Lockport N/A
815-525 Tds Metrocom South Beloit N/A
815-526 Teleport Communications America Crystal Lake N/A
815-527 Teleport Communications America Woodstock N/A
815-528 Teleport Communications America Mchenry N/A
815-529 Cellco Partnership Woodstock N/A
815-530 T-Mobile USA Joliet N/A
815-531 Teleport Communications America Joliet N/A
815-532 USA Mobility Wireless Morris N/A
815-533 Indiana Paging Network La Grange N/A
815-534 Level 3 Communications Frankfort N/A
815-535 Illinois Bell Tel Co Sterling N/A
815-536 USA Mobility Wireless La Grange N/A
815-537 Citizens Telecom Co Illinois-Frontier Citizens -IL Prophetstown N/A
815-538 Frontier North Mendota N/A
815-539 Frontier North Mendota N/A
815-540 T-Mobile USA Rockford N/A
815-541 United States Cellular Freeport N/A
815-542 Citizens Telecom Co Illinois-Frontier Citizens -IL Thomas N/A
815-543 United States Cellular Rockford N/A
815-544 Frontier North Belvidere N/A
815-545 New Cingular Wireless PCS Joliet N/A
815-546 New Cingular Wireless PCS Joliet N/A
815-547 Frontier North Belvidere N/A
815-548 Illinois Bell Tel Co Sterling N/A
815-549 T-Mobile USA Kankakee N/A
815-550 Level 3 Communications Grant Park N/A
815-551 Onvoy Lanark 8/1/2018
815-552 Illinois Bell Tel Co Lockport 4/10/2001
815-553 Paetec Itel Joliet 4/10/2001
815-554 Mediacom Telephony Of Illinois East Dubuque N/A
815-556 Level 3 Communications Plainfield 4/10/2001
815-557 MetroPCS Joliet N/A
815-558 United States Cellular Rockford N/A
815-559 Voip Innovations Chenoa N/A
815-560 MetroPCS Harvard 5/3/2002
815-561 Frontier North Rochelle N/A
815-562 Frontier North Rochelle N/A
815-563 Frontier North Cedarville N/A
815-564 Illinois Bell Tel Co Sterling N/A
815-565 Mediacom Telephony Of Illinois Savanna N/A
815-566 Level 3 Communications Belvidere 6/21/2002
815-567 Frontier North Campus N/A
815-568 Illinois Bell Tel Co Marengo N/A
815-569 Frontier North Capron N/A
815-570 Level 3 Communications Sandwich 8/21/2002
815-571 Mediacom Telephony Of Illinois Shannon 4/21/2006
815-572 Level 3 Communications Marengo N/A
815-573 Level 3 Communications Kankakee 2/27/2002
815-574 Aero North Communications Harmon N/A
815-575 New Cingular Wireless PCS Woodstock N/A
815-576 Aero North Communications Polo N/A
815-577 Illinois Bell Tel Co Plainfield N/A
815-578 Illinois Bell Tel Co Mchenry N/A
815-579 MetroPCS La Salle N/A
815-580 AT&T Cherry Valley 3/18/2003
815-581 Comcast IP Phone Spring Grove 10/6/2005
815-582 T-Mobile USA Joliet 10/6/2005
815-583 Aero North Communications Morrison N/A
815-584 Illinois Bell Tel Co Dwight N/A
815-585 Level 3 Communications Morris 5/3/2002
815-586 C-R Telephone Co. Ransom N/A
815-587 Level 3 Communications Ottawa 4/2/2002
815-588 Illinois Bell Tel Co Lockport N/A
815-589 Citizens Telecom Co Illinois-Frontier Citizens -IL Fulton N/A
815-590 T-Mobile USA Sterling 7/14/2003
815-591 Frontier North Hanover N/A
815-592 Cellco Partnership Kankakee N/A
815-593 T-Mobile USA De Kalb N/A
815-594 Frontier North Apple River N/A
815-595 AT&T Oregon 10/2/2003
815-596 AT&T Enterprises Marengo 2/10/2006
815-597 Frontier North Garden Prairie N/A
815-598 Frontier North Massbach N/A
815-599 Frontier North Freeport N/A
815-600-XXXX --- 815-699-XXXX
NPANXX Carrier1 Area Served2 Date3
815-600 New Cingular Wireless PCS Joliet 7/14/2003
815-601 United States Cellular Rockford N/A
815-602 First Communications Kankakee N/A
815-603 T-Mobile USA Joliet 9/28/2001
815-604 Onvoy Belvidere 7/31/2019
815-605 Level 3 Communications Grant Park 4/2/2002
815-606 First Communications Ottawa N/A
815-607 Onvoy Spectrum Pearl City 10/01/2024
815-608 T-Mobile USA Rockford 9/30/2002
815-609 Illinois Bell Tel Co Plainfield 10/24/2001
815-610 Onvoy Hennepin 10/30/2024
815-612 New Cingular Wireless PCS Momence 05/16/2025
815-613 New Cingular Wireless PCS Dixon 8/30/2019
815-614 Illinois Bell Tel Co Kankakee N/A
815-615 Level 3 Communications Mendota 10/31/2001
815-616 T-Mobile USA Freeport 1/7/2004
815-617 Teleport Communications America Ottawa N/A
815-618 New Cingular Wireless PCS Freeport 12/21/2006
815-619 Aero North Communications Rockton 5/27/2003
815-620 Peerless Network Of Illinois Minooka 10/31/2018
815-621 T-Mobile USA Rockford N/A
815-622 Illinois Bell Tel Co Sterling N/A
815-623 Frontier North Roscoe N/A
815-624 Frontier North Rockton N/A
815-625 Illinois Bell Tel Co Sterling N/A
815-626 Illinois Bell Tel Co Sterling N/A
815-627 Frontier North Paw Paw N/A
815-628 Frontier North West Brooklyn N/A
815-629 Frontier North Shirland N/A
815-630 T-Mobile USA Joliet 7/24/2006
815-631 Illinois Bell Tel Co Sterling N/A
815-632 Illinois Bell Tel Co Sterling N/A
815-633 Illinois Bell Tel Co Rockford N/A
815-634 Illinois Bell Tel Co Coal City N/A
815-635 Frontier North Chatsworth N/A
815-636 Illinois Bell Tel Co Rockford N/A
815-637 Illinois Bell Tel Co Rockford N/A
815-638 Frontier North La Moille N/A
815-639 Illinois Bell Tel Co Rockford N/A
815-640 Teleport Communications America Ottawa 12/28/2001
815-641 Cellco Partnership Joliet 1/21/2008
815-642 Level 3 Communications Minooka N/A
815-643 Frontier North Dover N/A
815-644 Rcn Telecom Services Of Illinios Crescent City N/A
815-645 Frontier North Stilman Valley N/A
815-646 Frontier North Tiskilwa N/A
815-647 Mediacom Telephony Of Illinois Cullom N/A
815-648 Frontier North Hebron N/A
815-649 Rcn Telecom Services Of Illinios Gardner N/A
815-650 MetroPCS Freeport N/A
815-651 Rcn Telecom Services Of Illinios Joliet N/A
815-652 Brightspeed Of Illinois Grand Detour N/A
815-653 Frontier North Wonder Lake N/A
815-654 Illinois Bell Tel Co Rockford N/A
815-655 Teleport Communications America Coal City 2/18/2019
815-656 Level 3 Communications Freeport 6/26/2002
815-657 Illinois Bell Tel Co Forrest N/A
815-658 Teleport Communications America Newark 8/2/2019
815-659 Frontier North Bureau N/A
815-660 Rcn Telecom Services Of Illinios Lockport N/A
815-661 Rcn Telecom Services Of Illinios Morris N/A
815-662 Level 3 Communications Momence N/A
815-663 Frontier North Spring Valley N/A
815-664 Frontier North Spring Valley N/A
815-665 Rcn Telecom Services Of Illinios Ottawa N/A
815-666 Cellco Partnership Joliet 8/30/2006
815-667 Illinois Bell Tel Co Utica N/A
815-668 Onvoy Rockford 4/2/2009
815-669 Level 3 Communications Mchenry N/A
815-670 T-Mobile USA Rockford N/A
815-671 Level 3 Communications Joliet N/A
815-672 Frontier North Streator N/A
815-673 Frontier North Streator N/A
815-674 New Cingular Wireless PCS Streator N/A
815-675 Frontier North Spring Grove N/A
815-676 Level 3 Communications Plainfield N/A
815-677 Cellco Partnership Dixon 3/17/2005
815-678 Frontier North Richmond N/A
815-679 Rcn Telecom Services Of Illinios Mchenry N/A
815-680 Rcn Telecom Services Of Illinios Manhattan N/A
815-681 Cellco Partnership Oglesby 7/30/2010
815-682 Frontier Communications Of The Carolinas Stockland N/A
815-683 Illinois Bell Tel Co Crescent City N/A
815-684 Citizens Telecom Co Illinois-Frontier Citizens -IL Chadwick N/A
815-685 New Cingular Wireless PCS Joliet N/A
815-686 Frontier North Piper City N/A
815-687 Rcn Telecom Services Of Illinios Woodstock N/A
815-688 Frontier North Strawn N/A
815-689 Frontier Communications Of Illinois Cullom N/A
815-690 T-Mobile USA Joliet N/A
815-691 Rcn Telecom Services Of Illinios Utica N/A
815-692 Frontier North Fairbury N/A
815-693 T-Mobile USA Joliet N/A
815-694 Frontier North Clifton N/A
815-695 Illinois Bell Tel Co Newark N/A
815-696 Aero North Communications Roscoe 5/27/2003
815-697 Frontier North Chebanse N/A
815-698 Frontier North Ashkum N/A
815-699 Frontier North Wyanet N/A
815-701-XXXX --- 815-799-XXXX
NPANXX Carrier1 Area Served2 Date3
815-701 Level 3 Communications Woodstock 4/2/2002
815-702 Centurylink Communications Saunemin N/A
815-703 T-Mobile USA Rockford 6/4/2002
815-704 Paetec Itel South Beloit 2/23/2001
815-705 Teleport Communications America Morris 12/28/2001
815-706 Exiant Communications Rockford 9/3/2019
815-707 Level 3 Communications Gilman 12/6/2001
815-708 Comcast IP Phone Rockford 6/23/2006
815-709 Level 3 Communications Coal City 12/28/2001
815-710 Teleport Communications America Morris 1/24/2001
815-712 MetroPCS La Salle 7/5/2002
815-713 New Cingular Wireless PCS Rockford 9/28/2001
815-714 Bandwidth.com Clec Joliet N/A
815-715 New Cingular Wireless PCS Joliet 5/22/2001
815-716 MetroPCS Sterling 10/31/2001
815-717 First Communications New Lenox N/A
815-718 United States Cellular Sterling 10/22/2002
815-719 MetroPCS Princeton 7/5/2002
815-720 Illinois Bell Tel Co Rockford N/A
815-721 Teleport Communications America Rockford N/A
815-722 Illinois Bell Tel Co Joliet N/A
815-723 Illinois Bell Tel Co Joliet N/A
815-724 Illinois Bell Tel Co Joliet N/A
815-725 Illinois Bell Tel Co Joliet N/A
815-726 Illinois Bell Tel Co Joliet N/A
815-727 Illinois Bell Tel Co Joliet N/A
815-728 Frontier North Wonder Lake N/A
815-729 Illinois Bell Tel Co Joliet N/A
815-730 Illinois Bell Tel Co Joliet N/A
815-731 Illinois Bell Tel Co Plainfield 2/16/2006
815-732 Frontier North Oregon N/A
815-733 Rcn Telecom Services Of Illinios Plainfield N/A
815-734 Frontier North Mount Morris N/A
815-735 New Cingular Wireless PCS Joliet N/A
815-736 Illinois Bell Tel Co Lisbon N/A
815-737 Sharon Tel. Co. South Sharon N/A
815-738 Leaf River Telephone Co. Leaf River N/A
815-739 MetroPCS Sycamore N/A
815-740 Illinois Bell Tel Co Joliet N/A
815-741 Illinois Bell Tel Co Joliet N/A
815-742 United States Cellular Rockford N/A
815-743 Frontier Communications-Prairie Graymont N/A
815-744 Illinois Bell Tel Co Joliet N/A
815-745 Frontier North Warren N/A
815-746 Marseilles Tel. Co. Of Marseilles Marseilles 5/13/2008
815-747 Citizens Telecom Co Illinois-Frontier Citizens -IL East Dubuque N/A
815-748 Frontier North De Kalb N/A
815-749 Bandwidth.com Clec Lockport 8/19/2022
815-750 Mtco Communications Marseilles 1/23/2003
815-751 Cellco Partnership De Kalb N/A
815-752 Frontier North De Kalb N/A
815-753 Frontier North De Kalb N/A
815-754 Frontier North De Kalb N/A
815-755 Onvoy Seneca 1/8/2016
815-756 Frontier North De Kalb N/A
815-757 United States Cellular De Kalb N/A
815-758 Frontier North De Kalb N/A
815-759 Illinois Bell Tel Co Mchenry N/A
815-760 Cellco Partnership Bureau 10/25/2005
815-761 Cellco Partnership De Kalb N/A
815-762 Cellco Partnership De Kalb N/A
815-763 Cellco Partnership Joliet 10/11/2022
815-764 United States Cellular De Kalb N/A
815-765 Frontier North Poplar Grove N/A
815-766 United States Cellular De Kalb N/A
815-767 American Messaging Services La Grange 4/16/2001
815-768 Illinois Bell Tel Co Joliet N/A
815-769 Level 3 Communications Seneca 4/27/2001
815-770 Charter IP Enabled Services Harvard 2/13/2006
815-771 Rcn Telecom Services Of Illinios Ashkum N/A
815-772 Citizens Telecom Co Illinois-Frontier Citizens -IL Morrison N/A
815-773 Illinois Bell Tel Co Joliet N/A
815-774 Illinois Bell Tel Co Joliet N/A
815-775 USA Mobility Wireless Woodstock N/A
815-776 Illinois Bell Tel Co Galena N/A
815-777 Illinois Bell Tel Co Galena N/A
815-778 Citizens Telecom Co Illinois-Frontier Citizens -IL Lyndon N/A
815-779 T-Mobile USA Plainfield 02/08/2024
815-780 Level 3 Communications La Salle 8/22/2001
815-781 Rcn Telecom Services Of Illinios Chebanse N/A
815-782 Level 3 Communications Plainfield N/A
815-783 Rcn Telecom Services Of Illinios Gilman N/A
815-784 Frontier North Genoa N/A
815-785 Rcn Telecom Services Of Illinios Watseka N/A
815-786 Frontier North Sandwich N/A
815-787 Frontier North De Kalb N/A
815-788 Illinois Bell Tel Co Crystal Lake 3/22/2001
815-789 Frontier North Orangeville N/A
815-790 T-Mobile USA Woodstock N/A
815-791 T-Mobile USA Joliet 7/24/2001
815-792 Illinois Bell Tel Co Harding N/A
815-793 T-Mobile USA De Kalb 6/25/2001
815-794 Marseilles Tel. Co. Of Marseilles Marseilles N/A
815-795 Marseilles Tel. Co. Of Marseilles Marseilles N/A
815-796 Frontier Communications-Prairie Flanagan N/A
815-797 Level 3 Communications Somonauk 12/6/2001
815-798 Aero North Communications Milledgeville N/A
815-799 Level 3 Communications Manlius 8/22/2001
815-800-XXXX --- 815-899-XXXX
NPANXX Carrier1 Area Served2 Date3
815-800 Mediacom Telephony Of Illinois Poplar Grove 3/24/2010
815-801 Aero North Communications Freeport N/A
815-802 Illinois Bell Tel Co Kankakee 9/28/2001
815-803 Aero North Communications Byron 3/22/2001
815-804 Aero North Communications Pecatonica N/A
815-805 Aero North Communications Durand N/A
815-806 Illinois Bell Tel Co Frankfort N/A
815-807 Aero North Communications German Valley N/A
815-808 Aero North Communications Winslow N/A
815-809 Aero North Communications Lena N/A
815-810 Aero North Communications Pearl City N/A
815-812 Aero North Communications Dakota N/A
815-813 Aero North Communications Apple River N/A
815-814 T-Mobile USA Woodstock 4/27/2001
815-815 Onvoy Spectrum Ladd 09/30/2024
815-816 Aero North Communications Cedarville N/A
815-817 Aero North Communications Hanover N/A
815-818 Aero North Communications Warren N/A
815-819 Aero North Communications Orangeville N/A
815-820 Aero North Communications Elizabeth N/A
815-821 United States Cellular Freeport 5/22/2001
815-822 New Cingular Wireless PCS Streator 4/27/2001
815-823 T-Mobile USA Joliet N/A
815-824 Frontier North Shabbona N/A
815-825 Frontier North Malta N/A
815-826 Cellco Partnership Somonauk 5/12/2004
815-827 Frontier North Maple Park N/A
815-828 MCIMetro Access Transmission Services Minooka 8/22/2001
815-829 Aero North Communications Chadwick N/A
815-830 New Cingular Wireless PCS Oglesby N/A
815-831 Aero North Communications Davis N/A
815-832 Frontier Communications Of Illinois Saunemin N/A
815-833 Aero North Communications Mcconnell N/A
815-834 Illinois Bell Tel Co Lockport N/A
815-835 Aero North Communications Dixon N/A
815-836 Illinois Bell Tel Co Lockport N/A
815-837 Aero North Communications Forreston N/A
815-838 Illinois Bell Tel Co Lockport N/A
815-839 MCIMetro Access Transmission Services Kankakee N/A
815-840 Aero North Communications Stockton N/A
815-841 Aero North Communications Mount Morris N/A
815-842 Frontier North Pontiac N/A
815-843 Aero North Communications Ashton N/A
815-844 Frontier North Pontiac N/A
815-845 Frontier North Scales Mound N/A
815-846 Level 3 Communications Joliet N/A
815-847 AT&T Enterprises Rockford 4/18/2005
815-848 Cellco Partnership Pontiac N/A
815-849 Frontier North Sublette N/A
815-850 Aero North Communications Seward N/A
815-851 USA Mobility Wireless Kankakee N/A
815-852 Aero North Communications Scales Mound N/A
815-853 Frontier North Wenona N/A
815-854 Frontier North Long Point N/A
815-855 Mediacom Telephony Of Illinois Milledgeville 4/2/2002
815-856 Leonore Mutual Tel. Co. Leonore N/A
815-857 Frontier North Amboy N/A
815-858 Frontier North Elizabeth N/A
815-859 Vonage America Rochelle 9/30/2019
815-860 Teleport Communications America Elwood 3/5/2010
815-861 New Cingular Wireless PCS Woodstock N/A
815-862 Charter IP Enabled Services Richmond 11/18/2008
815-863 Frontier North Rutland N/A
815-864 Citizens Telecom Co Illinois-Frontier Citizens -IL Shannon N/A
815-865 Frontier North Davis N/A
815-866 Cellco Partnership Princeton N/A
815-867 T-Mobile USA Pontiac 4/27/2001
815-868 Frontier North Mcconnell N/A
815-869 Frontier North Magnolia N/A
815-870 USA Mobility Wireless Rockford N/A
815-871 United States Cellular Rockford N/A
815-872 Frontier North Princeton N/A
815-873 Frontier North New Milford N/A
815-874 Frontier North New Milford N/A
815-875 Frontier North Princeton N/A
815-876 Frontier North Princeton N/A
815-877 Illinois Bell Tel Co Rockford N/A
815-878 New Cingular Wireless PCS Princeton N/A
815-879 Frontier North Princeton N/A
815-880 MCIMetro Access Transmission Services Woodstock 1/24/2001
815-881 Level 3 Communications Oregon N/A
815-882 Mcnabb Tel. Co. Mcnabb N/A
815-883 Illinois Bell Tel Co Oglesby N/A
815-884 MCC Telephony Earlville 3/23/2010
815-885 Frontier North Rock Cut N/A
815-886 Illinois Bell Tel Co Lockport N/A
815-887 Teleport Communications America Harvard 5/3/2002
815-888 Level 3 Communications Rochelle 11/27/2006
815-889 Frontier Communications Of The Carolinas Milford N/A
815-890 Aero North Communications New Milford 5/27/2003
815-891 Aero North Communications Winnebago 6/25/2001
815-892 Teleport Communications America Stilman Valley 11/21/2019
815-893 Comcast IP Phone Crystal Lake 12/30/2004
815-894 Frontier North Ladd N/A
815-895 Frontier North Sycamore N/A
815-896 Aero North Communications Shirland 7/24/2001
815-897 Mediacom Telephony Of Illinois Lyndon N/A
815-898 Aero North Communications Massbach 2/23/2001
815-899 Frontier North Sycamore N/A
815-900-XXXX --- 815-999-XXXX
NPANXX Carrier1 Area Served2 Date3
815-900 New Cingular Wireless PCS Mchenry 8/4/2010
815-901 Comcast IP Phone De Kalb 2/14/2005
815-902 Mediacom Telephony Of Illinois Thomson 6/25/2001
815-903 American Messaging Services Mchenry 2/27/2002
815-904 New Cingular Wireless PCS Rockford 8/31/2006
815-905 Level 3 Communications Lockport 2/27/2002
815-906 Mediacom Telephony Of Illinois Mount Carroll 4/21/2006
815-907 Level 3 Communications Manteno 12/6/2001
815-908 Cellco Partnership Freeport N/A
815-909 T-Mobile USA De Kalb 5/22/2001
815-910 Cellco Partnership Mendota 6/25/2001
815-912 Aero North Communications Belvidere 9/28/2001
815-913 Centurylink Communications Chadwick N/A
815-914 MetroPCS Rockford N/A
815-915 Level 3 Communications Princeton 12/28/2001
815-916 Onvoy Plattville N/A
815-917 Aero North Communications Rochelle N/A
815-918 Level 3 Communications Clifton 8/22/2001
815-919 T-Mobile USA Joliet 2/23/2001
815-920 Mediacom Telephony Of Illinois Cornell 11/22/2005
815-921 Illinois Bell Tel Co Rockford 4/27/2001
815-922 Cellco Partnership Kankakee N/A
815-923 Illinois Bell Tel Co Union N/A
815-924 Aero North Communications Prophetstown N/A
815-925 Frontier North Hennepin N/A
815-926 Level 3 Communications Wilmington 5/22/2001
815-927 Level 3 Communications Joliet N/A
815-928 Illinois Bell Tel Co Kankakee N/A
815-929 Illinois Bell Tel Co Kankakee N/A
815-930 Mediacom Telephony Of Illinois Elizabeth 6/4/2002
815-931 New Cingular Wireless PCS Joliet N/A
815-932 Illinois Bell Tel Co Kankakee N/A
815-933 Illinois Bell Tel Co Kankakee N/A
815-934 Frontier North Emington N/A
815-935 Illinois Bell Tel Co Kankakee N/A
815-936 Illinois Bell Tel Co Kankakee N/A
815-937 Illinois Bell Tel Co Kankakee N/A
815-938 Frontier North Forreston N/A
815-939 Illinois Bell Tel Co Kankakee N/A
815-940 Level 3 Communications Gardner 5/3/2002
815-941 Illinois Bell Tel Co Morris N/A
815-942 Illinois Bell Tel Co Morris N/A
815-943 Illinois Bell Tel Co Harvard N/A
815-944 Illinois Bell Tel Co Momence N/A
815-945 Frontier North Chenoa N/A
815-946 Citizens Telecom Co Illinois-Frontier Citizens -IL Polo N/A
815-947 Frontier North Stockton N/A
815-948 Citizens Telecom Co Illinois-Frontier Citizens -IL Hooppole N/A
815-949 Frontier North Cabery N/A
815-951 Aero North Communications Amboy N/A
815-952 Aero North Communications Lanark 7/18/2006
815-953 Cellco Partnership Kankakee N/A
815-954 Cellco Partnership Kankakee N/A
815-955 MetroPCS Joliet 7/5/2002
815-956 Citizens Telecom Co Illinois-Frontier Citizens -IL Morrison N/A
815-957 Level 3 Communications Rockton 2/22/2005
815-960 North County Communication Corporation Leaf River 6/4/2002
815-961 Illinois Bell Tel Co Rockford N/A
815-962 Illinois Bell Tel Co Rockford N/A
815-963 Illinois Bell Tel Co Rockford N/A
815-964 Illinois Bell Tel Co Rockford N/A
815-965 Illinois Bell Tel Co Rockford N/A
815-966 Illinois Bell Tel Co Rockford N/A
815-967 Illinois Bell Tel Co Rockford N/A
815-968 Illinois Bell Tel Co Rockford N/A
815-969 Illinois Bell Tel Co Rockford N/A
815-970 MetroPCS Sycamore 7/5/2002
815-971 Illinois Bell Tel Co Rockford N/A
815-972 Illinois Bell Tel Co Rockford N/A
815-973 United States Cellular Dixon N/A
815-974 Onvoy Hebron 7/3/2018
815-975 New Cingular Wireless PCS Belvidere 9/3/2002
815-977 MCIMetro Access Transmission Services Rockford 6/25/2003
815-978 Cellco Partnership Rockford N/A
815-979 Cellco Partnership Rockford N/A
815-980 Cellco Partnership Rockford 6/15/2006
815-981 Level 3 Communications De Kalb 9/30/2002
815-982 Mediacom Telephony Of Illinois Tampico N/A
815-983 American Messaging Services Rockford N/A
815-984 Frontier Communications Of The Carolinas Wellington N/A
815-985 Cellco Partnership Rockford N/A
815-986 Paetec Itel Rockford N/A
815-987 Illinois Bell Tel Co Rockford N/A
815-988 United States Cellular Rockford N/A
815-989 Mediacom Telephony Of Illinois Prophetstown 1/4/2005
815-990 Cellco Partnership Freeport 10/22/2002
815-991 New Cingular Wireless PCS Sycamore N/A
815-992 T-Mobile USA Streator 4/21/2005
815-993 New Cingular Wireless PCS Oglesby 9/22/2006
815-994 MetroPCS Dixon 4/14/2003
815-995 Teleport Communications America De Kalb 6/10/2009
815-996 Centurylink Communications Savanna N/A
815-997 Paetec Itel Rockford 3/26/2003
815-998 Frontier North Odell N/A
815-999 T-Mobile USA Joliet 7/14/2003
  1. NPA-NXX assigned carrier; with Number Pooling thousand block numbers are often assigned to other carriers as well; moreover, phone numbers can be ported between service providers
  2. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  3. Assignment date. N/A - mostly central office codes assigned before 2001.
  4. NXX prefixes last updated: November 22, 2025

Cities in area code 815

City1 County Time Zone1
Alden McHenry C
Amboy Lee C
Ancona Livingston C
Apple River Jo Daviess C
Arlington Bureau C
Aroma Park Kankakee C
Ashkum Iroquois C
Ashton Lee C
Baileyville Ogle C
Beaverville Iroquois C
Belvidere Boone C
Blackstone Livingston C
Bonfield Kankakee C
Bourbonnais Kankakee C
Braceville Grundy C
Bradley Kankakee C
Braidwood Will C
Buckingham Kankakee C
Bureau Bureau C
Byron Ogle C
Cabery Ford C
Caledonia Boone C
Campus Livingston C
Capron Boone C
Cedar Point La Salle C
Cedarville Stephenson C
Chadwick Carroll C
Chana Ogle C
Channahon Will C
Chatsworth Livingston C
Chebanse Iroquois C
Chenoa McLean C
Cherry Bureau C
Cherry Valley Winnebago C
Cissna Park Iroquois C
Clare Dekalb C
Claytonville Iroquois C
Clifton Iroquois C
Coal City Grundy C
Compton Lee C
Cornell Livingston C
Cortland Dekalb C
Crescent City Iroquois C
Creston Ogle C
Crystal Lake McHenry C
Cullom Livingston C
Dakota Stephenson C
Dalzell Bureau C
Dana La Salle C
Danforth Iroquois C
Davis Stephenson C
Davis Junction Ogle C
Deer Grove Whiteside C
Dekalb Dekalb C
Depue Bureau C
Dixon Lee C
Donovan Iroquois C
Dover Bureau C
Durand Winnebago C
Dwight Livingston C
Earlville La Salle C
East Dubuque Jo Daviess C
Eldena Lee C
Eleroy Stephenson C
Elizabeth Jo Daviess C
Elwood Will C
Emington Livingston C
Esmond Dekalb C
Essex Kankakee C
Fairbury Livingston C
Flanagan Livingston C
Forrest Livingston C
Forreston Ogle C
Frankfort Will C
Franklin Grove Lee C
Freeport Stephenson C
Fulton Whiteside C
Galena Jo Daviess C
Galt Whiteside C
Garden Prairie Boone C
Gardner Grundy C
Genoa Dekalb C
German Valley Stephenson C
Gilman Iroquois C
Goodwine Iroquois C
Grand Ridge La Salle C
Grant Park Kankakee C
Granville Putnam C
Graymont Livingston C
Hanover Jo Daviess C
Harmon Lee C
Harvard McHenry C
Hebron McHenry C
Hennepin Putnam C
Herscher Kankakee C
Hinckley Dekalb C
Holcomb Ogle C
Homer Glen Will C
Hooppole Henry C
Hopkins Park Kankakee C
Iroquois Iroquois C
Joliet Will C
Kankakee Kankakee C
Kasbeer Bureau C
Kempton Ford C
Kent Stephenson C
Kingston Dekalb C
Kinsman Grundy C
Kirkland Dekalb C
La Moille Bureau C
La Salle La Salle C
Ladd Bureau C
Lanark Carroll C
Leaf River Ogle C
Lee Lee C
Lee Center Lee C
Leland La Salle C
Lena Stephenson C
Leonore La Salle C
Lindenwood Ogle C
Lockport Will C
Long Point Livingston C
Lostant La Salle C
Loves Park Winnebago C
Lyndon Whiteside C
Machesney Park Winnebago C
Magnolia Putnam C
Malden Bureau C
Malta Dekalb C
Manhattan Will C
Manlius Bureau C
Manteno Kankakee C
Maple Park Kane C
Marengo McHenry C
Mark Putnam C
Marseilles La Salle C
Martinton Iroquois C
Mazon Grundy C
Mc Connell Stephenson C
Mc Nabb Putnam C
McHenry McHenry C
Mendota La Salle C
Milford Iroquois C
Milledgeville Carroll C
Millington Kendall C
Minooka Grundy C
Momence Kankakee C
Monroe Center Ogle C
Morris Grundy C
Morrison Whiteside C
Mount Carroll Carroll C
Mount Morris Ogle C
Nachusa Lee C
New Bedford Bureau C
New Lenox Will C
Newark Kendall C
Nora Jo Daviess C
Odell Livingston C
Oglesby La Salle C
Ohio Bureau C
Onarga Iroquois C
Orangeville Stephenson C
Oregon Ogle C
Ottawa La Salle C
Papineau Iroquois C
Paw Paw Lee C
Pearl City Stephenson C
Pecatonica Winnebago C
Peru La Salle C
Piper City Ford C
Plainfield Will C
Polo Ogle C
Pontiac Livingston C
Poplar Grove Boone C
Princeton Bureau C
Prophetstown Whiteside C
Putnam Putnam C
Ransom La Salle C
Reddick Kankakee C
Richmond McHenry C
Ridott Stephenson C
Ringwood McHenry C
Rochelle Ogle C
Rock City Stephenson C
Rock Falls Whiteside C
Rockford Winnebago C
Rockton Winnebago C
Romeoville Will C
Roscoe Winnebago C
Rutland La Salle C
Sandwich Dekalb C
Saunemin Livingston C
Savanna Carroll C
Scales Mound Jo Daviess C
Seatonville Bureau C
Seneca La Salle C
Serena La Salle C
Seward Winnebago C
Shabbona Dekalb C
Shannon Carroll C
Sheffield Bureau C
Sheldon Iroquois C
Sheridan La Salle C
Shirland Winnebago C
Somonauk Dekalb C
South Beloit Winnebago C
South Wilmington Grundy C
Spring Grove McHenry C
Spring Valley Bureau C
St Anne Kankakee C
Standard Putnam C
Sterling Whiteside C
Steward Lee C
Stillman Valley Ogle C
Stockland Iroquois C
Stockton Jo Daviess C
Strawn Livingston C
Streator La Salle C
Sublette Lee C
Sycamore Dekalb C
Tampico Whiteside C
Thomson Carroll C
Tiskilwa Bureau C
Toluca Marshall C
Tonica La Salle C
Triumph La Salle C
Troy Grove La Salle C
Union McHenry C
Union Hill Kankakee C
Utica La Salle C
Van Orin Bureau C
Verona Grundy C
Walnut Bureau C
Warren Jo Daviess C
Waterman Dekalb C
Watseka Iroquois C
Wedron La Salle C
Wellington Iroquois C
Wenona Marshall C
West Brooklyn Lee C
Wilmington Will C
Winnebago Winnebago C
Winslow Stephenson C
Wonder Lake McHenry C
Woodland Iroquois C
Woodstock McHenry C
Woosung Ogle C
Wyanet Bureau C
  1. Listed above are most places served by USA area code 815. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time (currently ).
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